Guard for punch presses



Patented Jan. 31, 1928.

Emo IscH'INGER, 0F EAST ROCHESTER, NEW YORK, Assrelvoa `or ONE-HALE `To FRANK KEIPER, F EAST ROCHESTER, NEWKYOR GUARD FOR PUNCH PRESSES.

i Application iled January 15, 19.21. Serial No. 437,624..

The object of this invention is to provide a guard4 for punch presses and other inachines, having adjustable supporting brackets with which the O'uard may be installed 5 on the machine by using the holes already drilled and tapped in the machine for the purpose of fastening other parts to the machine to also mount the guard on th-e machine.

Ul y Another object of this invention is to provide a guard for punch presses and other machines with brackets which permit a. ver tical adjustment of the guard on the machine.

This and other objects of this invention will be fully illustrated in the drawing, described in the specification and pointed out in the claims at the end thereof.

In the accompanying drawing :lo Fig. l is a perspective view of a punch press with the guard mounted thereon.

Fig. 2 is a detail perspective view of the ram of the press with the operating member Vof the guard mounted thereon.

Fig. 3 is a detail perspective view of a modified form of bracket Jfor mounting `the guard to the Vframe of a press. l

In the several figures of the drawing, like reference numerals indicate like parts.

:lo In mounting guards for punch presses to the frame of the machine, it has heretofore been necessary to drill and tap a series of special holes into both the frame and ram of the press. My present invention elimi- :sa' nates the drilling and tapping of such holes and makes it possible to mount the guardto the press by using the holes in the frame that are provided therein to fasten other parts of the press to the frame thereof. In a ma- 40 jority of the presses gib screws are provided in the face of the frame of the press to clamp the gibs to the frame to form the runway for the ram of the press to slide up and down therein. The ram in turn is always provided with a pair of cap screws .tortastening the male member of the vdie into the bottom of the ram. `These cap and gib screws in the frame and the ram of the press are` utilized in the mounting of the support-l ing brackets of the guard -to the frame of the press.

In the drawing, reference numeral l indicates the frame of the punch press. In this frame is mounted to reciprocate the ram 2.

Gibs 3 and l are provided at each side of the ram of the press and these gibs form between them and the frame the runwaysfor the ram to reciprocate therein. The gibs` 3 and 4 are fastened to the iframe by means ofthe gib screws 5 and 6 a series of each oi' whichis provided for each of the gibs 3 and 4. The gib screws 5 and 6 are placed at the same elevations and in a vertical row in the face of each of the gibs 8 and 4. F astened to the. frame by means of one of each of the gib screws v5 and 6V are a pair ofi-'base brackets 7 and 8. These base brackets are triangular in outline and are bifurcated at the apex of the angle by means of the slot l0. The front face ofv these base brackets is serrated with a series of vertical Serrat-ions on either side oit the slot lO. rIh'ese base brackets are placed with their back,v which is left smooth, against the front face of the frame and the gibs in such a manner that one of the gib screws engages into the sloty 10 of each` of base brackets 7 and 8. .The gib screws 5 and 6l which are used to clamp the base brackets in place on the frame of the press, are provided with rectangular washers 11. `These washers are serrated at the under side corresponding to the serratons on the basebrackets and when the gib screws are tightened the serrations or' this Washer engage the serrations of the base brackets. In this manner,

the brackets are not only clamped against the face of the frame and gibs but are also drawn laterally by the serrations until the serrations of the washers line up with the serrations of the` base brackets. l

Each of the triangular base brackets has a vertical flange l2 formed thereon. This flange Yis located opposite to the bifurcatf ed end ot the base brackets and extends back from the rear of the bracket and for ward from the front of Vthe bracket.V The rearward extension of' the bracket forms a long, vertical shoulder 13 which is placed against the vertical edge of the frame ofthe* press to line up the base bracket therewith. The support of the brackets on the press, secured by clamping the base brackets to the front face ofthe press, is thus supplemented by the support of the brackets against the side of the press which is secured by drawing the shoulder 13 against the side of thel frame of the press by reason4 ofthe engagement of thev serrationson the washer and those at the fill front of the base brackets. One gib screw is thus sufficient to secure a rigid fastening of the base brackets on the gibs and frame of the press.

`The outside of the forwardly lextending flange 12 of the base brackets is provided with a series of horizontal serrations 14. In the center ofthese serrationsis provided a slot 15, thru which the bolt 16 is adapted to pass in order to clamp the .hinge and lock brackets 17 and 18 to the base brackets 7 and 8, respectively. For this reason, both the hinge and the lock brackets have their inner end serrated with horizontal serrations corresponding to the seri-ations on the flange 12 of the base brackets.

The serrations of the hinge and lock brackets are adapted to engage with the serrations in the flanges of their corresponding base brackets and the' bolt 16, which passes thru the slot 15 in the flange and thru a suitable hole in the serrations of the hinge brackets, will firmly clamp the hinge bracket and the lock bracket to its respective base bracket at any desired elevation thereon. From an inspection of Fig. 1, it will be seen that the fiange 12 of the. base brackets is considerably longer in its vertical dimension than the width of the brackets that are fastened thereto. This permits a vertical adjustment of the hinge and lock bracket on these flanges because the engaging serrated faces of both the flanges 12 and the hinge and lock bracket provide a firm holdbctween them at any elevation of the flanges.

Hinged to the outer end ofthe hinge bracket 17 and extending to the outer end of the lock bracket 18, where it is locked in place by means of the lock'pin 19, is the bridge 20. This bridge is supported in front of the frame and ram of the press and carries the adjustable hinge block 21. On this hinge' block is mounted to swing the cam 22 which carries the guard arm 23. The guard arm 23, as shown in the drawing, is formed up from a single length of wire and the outer ends thereof, which run parallel to each other, are suitably clamped to the cam atione end thereof. The lower portion of the guard arm which is formed by bending the wire into a triangular shape, is filled out with a wire netting or other transparent material so that it does not obstruct the vision of the workman who is operating the press.

The cam 22 is operated by the roller 241; carried on the roller bracket 25. The roller bracket, in turn, is clamped to the ram bracket 26 by means of one of the cap screws 27, 27, provided in the ram for clamping the male member of the die in place at the bottom of the ram. This cap screw is provided with a rectangular washer similar to the washers 11 used for clamping the base brackets to the frame of the press. The

rain bracket extends from the bottom of the ram upwardly in a vertical'alignment with the ram. At the lower end the rain bracket projects under the rain. The portion of the rain bracket which projects under the ram, forms the shoulder 29 that rests against the under side of the ram. At the side of the ram at a point where the cap screws 2T are located on the ram of the press, the rain bracket is slotted as indicated at 30. r1`he cap screw 2 is adapted to pass thru the slot 30 with the washer 28 resting on top of it. j

The front Vface of the ram bracket is serrated the full length thereof with horizontal serrations and the serrations of the washer 28 are adapted to engage with the serrations on the ram bracket. In tightening the cap screw 27 the washer 28 tightlj7 clamps the lower end of the ram bracket against the ram and at the same time draws the shoulder 29 thereof against the lower edge of the ram. In this way, the ram bracket which carries the roller bracket 25, is rigidly clamped to the raln and moves up and down therewith.

The roller 24 engages into the cam `22 so that on the reciprocation of the ram, the cani 22 is oseillated and operates to swing the guard arm in a pendulum fashion from one side of the frame of the press to the other side thereof. In so doing, the operators hand is pushed aside by the guard on the descension of the ram and before the male and female member of the die are closed by the rain.. In this way, the operators hand cannot be caught between the male and fe.

male members of the press whether due to the carelessness of the operator or the automatic repeating of the ram of the press.

In Fig. 2 is shown a modification of one of the base brackets to which the binge and lock brackets are mounted. This type of base bracket is used when the base bracket is fastened to the frame of the press by means of the, adjusting screws for the gibs provided in some presses on the side of the frame of thepress. In this form the triangular base plate extends to the rear on the side of the press and one of the adjusting screws is adapted to engage into the bifurcation of the triangular plate. The outside of the triangular plate is serrated in the same manne' as the triangular base ol the base brackets illustrated in Fig. 1. A serrated washer is also used to clamp the base bracket illustrated in Fig. 3 in place on the side of the frame of the press. The shoulder 13 in this type of bracket is formed by a flange that projects in front of the frame so that in this form the base bracket is also rigidly forced against the frame at the corner thereof.

The fillet 30 formed on the ram of the press above the clamping screws 27, is engaged by a second shoulder 31 provided at igea-"nere the back of the ram bracket. The shoulder 3l is formed byahorizontal'ridge and serves to line up the rain bracket with the ram of the press in order to keep it in perfect align` ment therewith.

I claim:

4 l. In a guard for punch presses,the combination of a base bracket adaptedto be fastened to the frame of the press, a Shoulder on said bracket extending at right angles thereto to engage the edge of the press fiamaineans to clamp said bracket against the frame of the press and hold said shoulder against the edge of the frame of the press. I

2. In a guard for punch presses, the coinbination of a base bracket, a single cap screw adapted to clamp said base bracket to the frame of the press in a vertical alignment, an extension formed on said base bracket and projecting out fronr the frame of; the press a lateral extension formed on Asaid base bracket a shoulder formed on Said lateral extension to vprevent the turning of' saidv bracket around said cap screw.

3. In a guard for a punch press, the combination of a base bracket, said base bracket being bifurcated on one side thereof and being adapted to overhang the frame of the press with the other end thereof, a cap screw adapted to engage into the bifurcation in said bracket to adjustably clamp said base bracket to the frame of the press and means on said overhanging portion of said bracket to prevent the yturning of vsaid bracket on the frame of the press.

Ll. In a. guard for punch presses, the combination of a base bracket, a serrated face at the front of' said base bracket, a serrated 'asher adapted to be clamped against the serrated face of said base` bracket to hold said base bracketl rioidly against the frame of the punch press, a shoulder on said base bracket adapted to engage the frame of the press, said serrations on said base bracket and said washer being adapted to rigidly draw said shoulder against the frame of the press and prevent the turning of said base bracket on the frame of the press.

5. Ina guard for punch presses, the coinbination of a base bracket having a. slot proride-d therein, serrations on the face of said base bracket on either side of the slot provided therein, awasher, serrations on the under side of said washer, said serrations on the washer being adapted to engage the serrations on said base bracket, means to clamp said washer against said base bracket, a. flange formed on said base bracket, serrations on said flange, an outwardly projecting bracket adapted to be clamped to said flange, said bracket being adapted to be held rigidly on said flange by said ser-rations provided thereon.

6. In a guard for punch presses, the combination of a base bracket having atrianguiar bifurcated end at one side thereof', a flange atthe otherside of said bracket extending above and below the bifurcation in said base bracket, a shoulder vformed on said base bracket by said flange and means to clamp said base bracket to one side of the frame of the press and hold said shoulder of lsaid base bracket against the adjacent side of the press. l p

7. In a guard for punch presses, thel coinbination of a pair of base brackets, an inwardly extending' flange formed on saidbase brackets, a cap screw adapted to clamp the inner end of each of said flanges on said `base brackets to the frame of the press, a

shoulder on said base bracket, said shoulder being adapted to engage the adjacent side of the press to which said base bracket is fastened, a bridge carried between said base brackets 1n front of said press,y and a guard f mounted to swing" on said bridge.

S. In a guard for punch presses, the coin-V bination of a pair of base brackets, a. flange having a bifurcated end on each of said base brackets, a cap screw engaging saidbifurcation in said flange clamping said flange to the frame of the press, a` shoulder formed on said base bracket at the other end of said flange,` said` shoulder beingadapted to engage the adjacent side of the frame of the press 4to brace said base bracket on the frame of the press, means for clamping a pair of outwardly projecting brackets to said base brackets, a bridge mounted between said outwardly projecting brackets and a guard mounted to swing Ion said bridge.

9. In a guard for punch presses, the coinbination of a. base bracket having vertical serrations cut therein, clamping means having corresponding vertical serrations formed thereon adapted to engage said vertical serrations on said base bracket to clamp said base bracket against the frame of the press, a vertical fiange formed on said base bracket, serrations cut into said flange, a supporting bracket, serrations cut into said supporting bracket, said serrations on said supporting bracket being adapted to engage with said serrations on said liange and means to clamp said support-ing bracket to said' flange on said base bracket, said vertical serrations on said base bracket and said clamping means being adapted to force said verti-V cal flange against the side of the frame oil of the press.

10. In a guard for punch presses, the combination of' a pair of base brackets adapted to be clamped to the face of the :frame of the press, a shoulder adapted to overhang the frame of the press formeel on each of s-aid base brackets, means for clamping said base brackets to the face of the frame of vthe press and draw said shoulders laterally against the frame of the press, a

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bridge supported between said brackets, and a guard mounted to swing from said bridge.

11. In a guard for punch presses,ithe combination of a base bracket, said base bracket having a smooth back and a serrated face, a clamping member adapted to engage said serrated face and clamp the smooth back oi saidy base bracket against the `face of ythe frame of' the punch press, a shoulder on said base bracket, said shoulder on said base bracket being drawn laterally against a shoulder on the frame of the press.

l2. In a guard for punch presses, the combination of a pair of base brackets, clamping means adapted to clamp said base brackets to the face oil the frame of the press, an 'outwardly projecting vertical flange Aon each of said base brackets, horizontal serrations ou each of said vertical flanges, supporting brackets having corresponding horizont-al serrations adapted to be clamped to the vertical flanges of said base backets, a bridge mounted between said .supporting` brackets, a guard mounted to swing from said bridge.

13. In a guard for punch presses, the combination ot a base bracket, said base bracket having a smooth back and a serrated face, a clamping member adapted to engage said serrated face and clamp the smooth back of said base bracket against the face of the Jframe of the punch press, a

shoulder on said base b acket, said shoulder on said base bracket being drawn laterally against a shoulder on the frame of the press, a bracket having a smooth back and a serrated face, clamping means adapted to clamp said bracket to the ram o'l' the press, a shoulder on said bracket, said shoulder being adapted to be drawn against a shoulder provided on the ram of the press on the clamping of said bracket to the ram of the press, a bridge, a guard mounted to swing on said bridge, an opera-ting member carried by said bracket, said operating mem ber operating said guard mounted to swing from said bridge.

14. In a guard for punch presses, haring a reciprocating member, the con'lbination of a bracket, horizontal scrrations on the face of said b ackct, clamping means adapted to engage said serrationsfon said bracket and clamp said bracket against said reciprocating member of said press, a shoulder formed at the back of said bracket, said shoulder being adapted to engage a shoulder on said reciprocating member, said shoulder on said bracket being drawn against the shoulder on said reciprocating member on the clamp ing of said bracket to said reciprocating member by said clamping means.

In testimony whereof I afiix my signature.

ERIC ISCHINGER. 

